Effect of Material Stiffness Variation on Shakedown Solutions of Soils Under Moving Loads

Shu Liu, Juan Wang, Dariusz Wanatowski, Hai Sui Yu

Research output: Chapter in Book/Conference proceedingConference contributionpeer-review

Abstract

Shakedown limits of pavements and railway foundations can be calculated based on shakedown theorems. These values can be used to guide the thickness designs of pavement and railway constructions considering material plastic properties. However, most existing shakedown analyses were carried out by assuming a unique stiffness value for each material. This paper mainly concentrates on the influence of stiffness variation on the shakedown limits of pavements and railway foundations under moving loads. Finite element models as well as a user-defined material subroutine UMAT are first developed to obtain the elastic responses of soils considering a linearly increasing stiffness modulus with depth. Then, based on the lower-bound shakedown theorem, shakedown solutions are obtained by searching for the most critical self-equilibrated residual stress field. It is found that for a single-layered structure, the rise of a stiffness changing ratio will give a larger shakedown limit; and the increase is more pronounced when the friction angle is relatively high. For multi-layered pavement and railway systems, neglecting the stiffness variation may overestimate the capacity of the structures.

Original languageEnglish
Title of host publicationPavement Materials and Associated Geotechnical Aspects of Civil Infrastructures - Proceedings of the 5th GeoChina International Conference 2018 – Civil Infrastructures Confronting Severe Weathers and Climate Changes
Subtitle of host publicationFrom Failure to Sustainability, 2018 in HangZhou, China
EditorsWJvdM Steyn, Irina Holleran, BooHyun Nam
PublisherSpringer Science and Business Media B.V.
Pages73-82
Number of pages10
ISBN (Print)9783319957586
DOIs
Publication statusPublished - 2019
Event5th GeoChina International Conference on Civil Infrastructures Confronting Severe Weathers and Climate Changes: From Failure to Sustainability, 2018 - HangZhou, China
Duration: 23 Jul 201825 Jul 2018

Publication series

NameSustainable Civil Infrastructures
ISSN (Print)2366-3405
ISSN (Electronic)2366-3413

Conference

Conference5th GeoChina International Conference on Civil Infrastructures Confronting Severe Weathers and Climate Changes: From Failure to Sustainability, 2018
Country/TerritoryChina
CityHangZhou
Period23/07/1825/07/18

Keywords

  • Shakedown Limit
  • Shakedown Solution
  • Shakedown Theorem
  • Variable Stiffness
  • Varying Material Stiffness

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Computational Mechanics
  • Geotechnical Engineering and Engineering Geology
  • Environmental Engineering

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